Beta spectrometry with metallic magnetic calorimeters

Martin Loidl (1) , Matias Rodrigues (1) , Cindy Le Bret (1) , Xavier Mougeot (1)

1 LNHB (CEA, LIST) - Laboratoire National Henri Becquerel (CEA, LIST)

Metallic magnetic calorimeters are a specific type of cryogenic detectors that have been shown to enable precise measurement of the shape of low energy beta spectra. The aim of their use at LNHB is the determination of the shape factors of beta spectra. The beta source is enclosed in the detector absorber, allowing for very high detection efficiency. It has turned out that the type of source is of crucial importance for the correctness of the measured spectrum. Spectra of 63Ni measured with several sources prepared by drying a NiCl2 solution differ from one another and from theory, whereas spectra measured with electroplated sources are reproducible and agree with theory. With these latter measurements we could confirm the atomic exchange effect down to very low energy (200 eV).

Mots clés: metrology; beta radionuclide; beta spectrum; shape factor; beta source; detection efficiency; spectrum measurement; 63Ni; NiCl2 solution; electroplated source; atomic exchange; Beta spectrometry; Ionizing radiations; cryogenic detector; Metallic magnetic calorimeter; cryogenic detectors; metallic magnetic calorimeters; ionizing radiation metrology; nuclear data

Domaines: Instrumentations et Détecteurs [physics.ins-det]; Physique Nucléaire Expérimentale [nucl-ex]

Martin Loidl, Matias Rodrigues, Cindy Le Bret, Xavier Mougeot. Beta spectrometry with metallic magnetic calorimeters. Applied Radiation and Isotopes, 2014, Proceedings of the 19th International Conference on Radionuclide Metrology and its Applications 17–21 June 2013, Antwerp, Belgium, 87, pp.302 - 305. ⟨10.1016/j.apradiso.2013.11.024⟩. ⟨hal-01894701⟩